re PR libstdc++/48698 (gnu-versioned-namespace problems)

re PR libstdc++/48698 (gnu-versioned-namespace problems)

2011-09-26  Benjamin Kosnik  <bkoz@redhat.com
            Jonathan Wakely  <jwakely.gcc@gmail.com>

	PR libstdc++/48698
	* acinclude.m4 (GLIBCXX_ENABLE_SYMVERS): Set libtool_VERSION here.
	* configure.ac: Move AC_SUBST of libtool_VERSION past call to
	GLIBCXX_ENABLE_SYMVERS.
	* configure: Regenerate.
	* include/bits/c++config: Use __7 as versioned namespace name.
	* config/abi/pre/gnu-versioned-namespace.ver: Change mangling as
	per above.
	* include/c_global/cwchar: Adjust nested namespaces.
	* testsuite/20_util/bind/48698.cc: Add test case.
	* testsuite/ext/profile/mutex_extensions_neg.cc: Change line number.

From-SVN: r179221